the following are physics questions. im having a hard time understanding and deeply appreciate your help. thank you in advance.

007 (part 1 of 2) 2.0 points A gas expands when 654 J of energy is added to it by heat. The expanding gas does 428 J of work on its surroundings. What is the overall change in the internal energy of the gas? Answer in units of J. 008 (part 2 of 2) 2.0 points If the work done by the gas is 976.3 J, how much energy must have been added as heat in order for the change in internal energy at the end of the process to equal the initial change in internal energy? Answer in units of J. 009 (part 1 of 2) 2.0 points Over the course of a day, 2 kg of water evaporates from the leaves of a corn plant. How much energy is required to evaporate the water? Assume the temperature of the leaves is 28 O, c = 4190 J/kg-K, and L1,, = 2.26 x 106 J/kg. Answer in units of J. 010 (part 2 of 2) 2.0 points If the plant is active for 12 hrs, how much power does this correspond to? Answer in units of W. 011 2.0 points What is the nal equilibrium temperature when 16 g of milk at 50C is added to 111 g of coffee at 65C? Assume the specic heats of milk and coffee are the same as that of water, and neglect the specic heat of the container. Answer in units of C30. 012 2.0 points If a 52 m steel footbridge experiences extreme temperatures between 13C)C and 47C, What is the range in size of this bridge if it measures exactly 52 m at 18 C? (Steel has a coefficient of linear expansion of 1.1 x 10- /'C) Answer in units of m.015 2.0 points A 31 kg male emperor penguin under a clear sky in the Antarctic winter loses very little heat to the environment by convection; its feathers provide very good insulation. The outside of the penguin's body is a chilly 20 DC, but its surroundings are an even chillier 31 GC. The penguin's surface area is 0.56 mg, and its emissivity is 0.97. What is the net rate of energy loss by radiation? Assume o = 5.67 X 10 W/m2K4. Answer in units of W